struts2 action中获取request session application的方法详解编程语言

共四种方式：

其中前两种得到的是Map String,Object  后两种得到的才是真正的request对象

而Map就是把request对象中的属性取出做成了键值对而已。

【方法一】

public class LoginAction { 

 private Map request; 

 private Map session; 

 private Map application; 

 public String execute() { 

 request = (Map)ActionContext.getContext().get("request"); 

 session = ActionContext.getContext().getSession(); 

 application = ActionContext.getContext().getApplication(); 

 request.put("username1", "jingjing1"); 

 session.put("username2", "jingjing2"); 

 application.put("username3", "jingjing3"); 

 return "success"; 

}

取出结果

 body 

 String username1 = (String)request.getAttribute("username1"); 

 String username2 = (String)session.getAttribute("username2"); 

 String username3 = (String)application.getAttribute("username3"); 

 %=username1 % 

 %=username2 % 

 %=username3 % 

 /body 

【方法二】

public class LoginAction implements RequestAware,SessionAware,ApplicationAware { 

 private Map String, Object request; 

 private Map String, Object session; 

 private Map String, Object application; 

 public void setRequest(Map String, Object request) { 

 // TODO Auto-generated method stub 

 this.request = request; 

 public void setSession(Map String, Object session) { 

 // TODO Auto-generated method stub 

 this.session = session; 

 public void setApplication(Map String, Object application) { 

 // TODO Auto-generated method stub 

 this.application = application; 

 public String execute() { 

 request.put("username1", "jingjing11"); 

 session.put("username2", "jingjing222"); 

 application.put("username3", "jingjing33"); 

 return "success"; 

【方法三】

public class LoginAction { 

 private HttpServletRequest request; 

 private HttpSession session; 

 private ServletContext application; 

 public String execute() { 

 request = ServletActionContext.getRequest(); 

 session = request.getSession(); 

 application = session.getServletContext(); 

 //application = ServletActionContext.getRequest().getSession().getServletContext(); 

 request.setAttribute("aaa", "aaa"); 

 session.setAttribute("bbb", "bbb"); 

 application.setAttribute("ccc", "ccc"); 

 return "success"; 

}

【方法四】

public class LoginAction implements ServletRequestAware { 

 private HttpServletRequest request; 

 private HttpSession session; 

 private ServletContext application; 

 public void setServletRequest(HttpServletRequest request) { 

 // TODO Auto-generated method stub 

 this.request = request; 

 this.session = request.getSession(); 

 this.application = session.getServletContext(); 

 public String execute() { 

 request.setAttribute("111", "111"); 

 session.setAttribute("222", "222"); 

 application.setAttribute("333", "333"); 

 return "success"; 

}

HttpServletRequest方法总结:

HttpServletRequest接口是继承自ServletRequest接口的，增加了和HTTP相关的一些方法

getScheme() 方法返回请求的计划，比如http,https或者ftp.
getServerName() 方法返回被发送请求的服务器的主机名
getServerPort() 方法返回被发送请求的端口号。
getContextPath() 返回请求地址的根目录，以 / 开关，但不是以 / 结尾。
一个常用的获得服务器地址的连接字符串是：
String path = request.getContextPath();
String basePath = request.getScheme()+ :// +request.getServerName()+ : +request.getServerPort()+path+ /

getCookies() 取得cookie
getMethod() 取得请求方法，如get,post或put
getRequestURL() 取得请求URL(统一资源定位符)
getRequestURI() 取得请求URI(统一资源标识符)
getSession() 取得对应session

public HttpSession getSession();
public HttpSession getSession(boolean create);
返回与这个请求关联的当前的有效的session。如果调用这个方法时没带参数，那么在没有session与这个请求关联的情况下，将会新建一个session。如果调用这个方法时带入了一个布尔型的参数，只有当这个参数为真时，session才会被建立。

ServletRequestAware与RequestAware的区别

ServletRequestAware——提供对HttpServletRequest对象的访问
RequestAware ——通过Map来提供对所有request属性的访问

原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/14385.html